Rigol DS1204B 4-channel oscilloscope, Digital Storage oscilloscope, DS1204B User Manual

Product codes

DS1204B

RIGOL

User‟s Guide for DS1000B Series

3-9

Figure 3-6

Ellipse method to observe the phase difference

Sin

 = A/B or C/D, where  = phase shift (in degrees) between the two signals.

From the formula above, you could get:

 = arcsine (A/B) or arcsine (C/D)

If the main axis of the ellipse is at I and III quadrant,

 must be in the range of

(0~π/2) or (3π/2~2π). If the main axis is at II and IV quadrant,

 must be in the

range of (π/2~π) or (π~3π/2).

A B

Signal must be

centered in X